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<p>In this study, the effects of Al<sub>2</sub>O<sub>3</sub>/Y<sub>2</sub>O<sub>3</sub> ratios and synthesis conditions, such as temperature, calcination time on phase formation, density, and mechanical properties of advanced engineering ceramics SiAlON were investigated. The synthesis conditions were optimized at 1650&#xa0;°C for 5&#xa0;h in N<sub>2</sub> environment at a pressure of 1.0&#xa0;MPa. The ratio Al<sub>2</sub>O<sub>3</sub>/Y<sub>2</sub>O<sub>3</sub> had a significant effect on the phase composition, density, and hardness of β-SiAlON. The optimal synthesis of β-SiAlON showed excellent results: the high density of 3.21&#xa0;g/cm<sup>3</sup>; the low water absorption of 0.20%; the porosity of 0.61% and the significant hardness of 18.00 GPa.</p>

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The Effect of Al2O3/Y2O3 Ratio on Phases, Density and Mechanical Strength of SiAlON Advanced Technical Ceramics

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Tran Van Cuong,
  • Dang Viet Cuong,
  • Ninh Duc Ha,
  • Dang Quoc Khanh,
  • Van-Duong Dao

摘要

In this study, the effects of Al2O3/Y2O3 ratios and synthesis conditions, such as temperature, calcination time on phase formation, density, and mechanical properties of advanced engineering ceramics SiAlON were investigated. The synthesis conditions were optimized at 1650 °C for 5 h in N2 environment at a pressure of 1.0 MPa. The ratio Al2O3/Y2O3 had a significant effect on the phase composition, density, and hardness of β-SiAlON. The optimal synthesis of β-SiAlON showed excellent results: the high density of 3.21 g/cm3; the low water absorption of 0.20%; the porosity of 0.61% and the significant hardness of 18.00 GPa.